Yes, you do have to wear a seatbelt in North Dakota if you are sitting in one of the front seats, and passengers under the age of 18 must wear a seatbelt no matter where they’re sitting in the vehicle.
The seatbelt law in North Dakota is a secondary offense, meaning that an officer can’t pull you over for not wearing a seatbelt. If they pull you over for another violation, like speeding or running a red light, and then notice that you are not wearing a seatbelt, you could be issued a traffic ticket.